Giant rock crabs are massive versions of the weaker Rock crab. They lie in wait for prey, disguised as large boulders. When approached, they attack, unless they have become tolerant, in which case they remain as "boulders" - attempting to cast a spell on them gives the message "You can't attack this NPC."

Giant rock crabs are only initially aggressive if they are approached while dormant. Once they are moving and the targeted player is out of range, they stop being aggressive and will ignore players that don't attack them. They eventually become dormant boulders again after a while if they are not attacked.



The giant rock crab is one of few monsters in RuneScape that will retreat from battle when they become critically wounded. This can be troublesome, as they are found in a single-way combat area. This can be prevented by attacking them while their back is turned to a nearby wall, so that they move away from the player and back up into the wall. If they move too far away, the player will follow them and risk being attacked by another rock crab. There are several protruding sections of the walls in the area that can be used as safespots which are ideal as the crabs' main weakness is magic.



Item Quantity Rarity GE market price
Bones Bones 1 Always 89


Item Quantity Rarity GE market price
Water rune Water rune 1–39 Uncommon 4–156
Earth rune Earth rune 2–37 Uncommon 8–148
Air talisman Air talisman 1 Rare 92
Mind talisman Mind talisman 1 Rare 3,875
Fire talisman Fire talisman 1 Rare 4,924
Cosmic talisman Cosmic talisman 1 Rare 784
Body talisman Body talisman 1 Rare 1,028
Water talisman Water talisman 1 Rare 171
Earth talisman Earth talisman 1 Rare 310


Item Quantity Rarity GE market price
Steel platebody Steel platebody 1 Uncommon 901
Black claws Black claws 1 Uncommon 407
Black platebody Black platebody 1 Uncommon 3,696
Mithril axe Mithril axe 1 Uncommon 75
Rock-shell gloves Rock-shell gloves 1 Uncommon 489
Rock-shell boots Rock-shell boots 1 Uncommon 275
Black warhammer Black warhammer 1 Rare 332
Adamant longsword Adamant longsword 1 Rare 1,644
Adamant warhammer Adamant warhammer 1 Rare 2,204


Item Quantity Rarity GE market price
Poison ivy seed 5 Poison ivy seed 1 Uncommon 18
Belladonna seed 5 Belladonna seed 1 Uncommon 57
Herb seed 5 Guam seed 1 Uncommon 9
Herb seed 5 Marrentill seed 1 Uncommon 5
Herb seed 5 Tarromin seed 1 Uncommon 10
Herb seed 5 Harralander seed 1 Uncommon 31
Herb seed 5 Toadflax seed 1 Rare 795
Herb seed 5 Ranarr seed 1 Rare 45,466
Herb seed 5 Irit seed 1 Rare 47
Herb seed 5 Avantoe seed 1 Rare 1,675
Herb seed 5 Snapdragon seed 1 Rare 54,551
Herb seed 5 Cadantine seed 1 Rare 1,034
Herb seed 5 Lantadyme seed 1 Rare 2,358
Herb seed 5 Dwarf weed seed 1 Very rare 423
Herb seed 5 Torstol seed 1 Very rare 58,385


Item Quantity Rarity GE market price
Grimy guam leaf Grimy guam leaf 1 Uncommon 15
Grimy marrentill Grimy marrentill 1 Uncommon 13
Grimy tarromin Grimy tarromin 1 Uncommon 132
Grimy harralander Grimy harralander 1 Uncommon 674
Grimy ranarr weed Grimy ranarr weed 1 Rare 7,640
Grimy irit leaf Grimy irit leaf 1 Rare 775
Grimy avantoe Grimy avantoe 1 Rare 1,814
Grimy kwuarm Grimy kwuarm 1 Rare 1,165
Grimy cadantine Grimy cadantine 1 Rare 1,312
Grimy lantadyme Grimy lantadyme 1 Rare 1,391
Grimy dwarf weed Grimy dwarf weed 1 Rare 448


Item Quantity Rarity GE market price
Coins 100 Coins 27; 28; 42; 70; 137 Common Not sold
Raw lobster Raw lobster 1 Common 210
Raw bass Raw bass 1 Common 457
Tinderbox Tinderbox 1 Common 62
Rock-shell splinter Rock-shell splinter 1 Uncommon (1/64) 24,845
Rock-shell chunk Rock-shell chunk 1 Uncommon (1/64) 12,280
Rock-shell shard Rock-shell shard 1 Uncommon (1/64) 21,332
Casket Casket 1 Rare 731
Clue scroll (medium) Clue scroll (medium) 1 Very rare Not sold

Gem drop table

In addition to the drops above, this monster has access to the gem drop table.

Show/hide gem drop table
Item Quantity Rarity GE market price
Uncut sapphire Uncut sapphire 1 Rare 455
Uncut emerald Uncut emerald 1 Rare 679
Uncut ruby Uncut ruby 1 Rare 1,249
Nature talisman Nature talisman 1 Very rare 744
Uncut diamond Uncut diamond 1 Very rare 2,627
Rune javelin Rune javelin 5 Very rare 875
Loop half of key Loop half of key 1 Very rare 10,307
Tooth half of key Tooth half of key 1 Very rare 10,840
Rune spear Rune spear 1 Very rare 11,933
Shield left half Shield left half 1 Very rare 65,697
Dragon spear Dragon spear 1 Very rare 37,226
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